Phycology Section, Patrick Center for Environmental Research, Academy of Natural Sciences of Drexel University. Cyclotella gordonensis (NADED 20069). https://diatom.ansp.org/taxaservice/ShowTaxon1.ashx?naded_id=20069. Accessed 19 Mar 2018. This web service reports all information about a given algae taxon available at the time of retrieval.